Drill grinder device



L. E. WHITESEL DRILL GRINDER DEVICE Oct. 6, 1959 2 Sheets-Sheet 1 Filed Feb. 26, 1957 R mi/ W 7 M W 2 6 l w E 3 N E R A L O L T F- T W A O// Y B v A FIG-2 Oct. 6, 1959 L; E. WHITESEL 2,907,149

DRILL GRINDER DEVICE Filed Feb. 26, 1957 2 Sheets-Sheet 2 FIG-6 INVENTOR. LOWELL E. WHH'ESEL ATTORNEYS United States Patent DRILL GRINDER DEVICE Lowell E. Whitesel, Columbus, Ohio Application February 26, 1957, Serial No. 642,586

3 Claims. (Cl. 51219) This invention relates to a holder for drill grinding.

In the grinding and sharpening of twist drills the lip clearance, as is known, is of very considerable importance; the heel, that is the surface of the point back of the cutting lip, is usually ground at an angle of 12-15 degrees away from the cutting lip. For optimum strength this heel v is rounded off from the cutting lip. A primary object of this invention is to provide a drill holder which in its use will provide'the drill being ground with an appropriate heel surface in the rear of each cutting edge; such is attained in the practice of the invention by providing a holder which permits retraction of the drill being ground while the drill is moved in an arc to grind the lip.

A further object of the invention is to provide a manually operable holder which is of simple and improved construction, composed of a few but simple readily assembled parts, all so constructed and arranged as to preclude the liability of breakage or derangement of the same; which device is positive in operation, of small size and weight, and which has proved thoroughly efiicient in the attaining of the ends for which it is designed.

These and other allied objects and advantages will become more apparent by reference to the following detailed description and accompanying drawings wherein:

Figure l is an elevational view showing in longitudinal sections the holding device of invention with a drill to be ground mounted thereon;

Figure 2 is a sectional view taken on line 22 of Figure 1;

Figure 3 is a view taken substantially on line 33 of Figure 1;

Figure 4 is a view taken substantially on line 44 of Figure 1;

Figure 5 is a fragmentary and exploded view of a portion of the structure of Figure 1;

Figure 6 is a plan view of the structure of Figure l in operative position adjacent a grinding wheel; and

Figure 7 is a sectional view taken on line 7--7 of Figure 1.

Referring to the drawings more in detail the numeral 1 generally indicates a mounting on which there is supported a standard designated generally at 2; a fixture 3 is pivotally secured on the standard and extends forwardly and rearwardly of the standard 2.

Mounting 1 comprises a base plate 4 having oppositely disposed guides 5, 6 (Figure 2) forming a way 7 in which a retractile element or sliding block 8 is positioned. Suitably the sliding block is in the form of an isosceles trapezoid having a shorter upper side (Figure 4).

The block 8 is provided *with a circular aperture 9 which extends wholly through the block. Rearwardly the block 8 carries a button 19 which receives one end of a coil spring 11, the opposite end of which spring extends into a recess 12 and abuts against an end closure 13. As shown in Figures 1 and 2 the device is in operative position and spring 11 is compressed. The end closure 13 may suitably be in the formof a thick plate and the closure and the guides 5, 6, as most clearly shown in Figure 2, are provided with cooperating threaded apertures and threaded bolts indicated generally at 14, 15 for retaining the closure 13 on the guides and base.

As indicated at 16 the closure 13 is suitably provided with a lip which extends slightly over the guides and assists in alignment of the closure with the guides.

Referring now to the forward end of the base plate 4 the numeral 17 indicates an end closure which, as indicated at 18, 19, is suitably secured to the guides 5, 6 by threaded screws extending into cooperating threaded apertures of the guides; the closure 17 like the closure 13 may be secured to the guides in any suitable'manner.

Closure 17 is provided with an overhanging portion 20 which incorporates a vertically extending bore 21. A

flat plate 22 is supported across the guides 5, 6 between the end closures and is provided with an aperture 23 which is in vertical alignment with the bore 21 and which receives a pin-like shaft 24 of a roller 25 provided with an upper shaft 26 which extends into the bore 21. Thus the roller 25 is rotatably journaled between the over-hanging portion 29 of the end closure 17 and the flat plate 22. Plate 22 is provided with a longitudinally extending opening 27 exposing the aperture 9. The opening 27 is suitably of such a length as to be approximately twice that of the diameter of the aperture 9.

The standard 2 has a lower cylindrical portion 28 which extends through the opening 27 and into the aperture 9 of the block 8 for rotatably supporting the standard on the mounting 1. The support of the standard above the surface of the base plate 4 (Figures 1 and 3) is effected through a projection of the standard generally indicated at 30, the projection suitably providing cam surfaces 32, 34 extending from a root 36 and terminating at 38 in the extremity of the projection.

Thus the structure described is effective to occasion retraction of the standard 2 and sliding block 8 rearwardly against the action of the spring 11 when the standard is rotated to the position of Figure 1. The camming action between the projection 30 and the roller 25 causes rectilineal movement of the standard and block as the standard rotates. This movement occurs smoothly due to the contour of the cam surfaces; two cam surfaces terminating at 38 are provided in order that rectilineal movement will take place with either clock-wise or counter-clockwise rotation of the standard.

The standard 2 at its upper extremity is bifurcated and terminates in a pair of ears 4t), 42 between which a depending fiange 44 of the drill fixture 3 extends. The flange 44 and the ears 40, 42-receive therethrough an externally threaded bolt 46; an internally threaded knurled nut 43 is received on the bolt 46, and tightening of the nut occasions a spring action in the bifurcated portion of the standard 2 to securely retain the flange 44 between the ears 40, 42.

Integral with the flange 44 is a collar 50 complete in the circumferential sense and which threadedly receives a securing nut 52, for a purpose which will become apparent hereinafter. Supported by the collar 5t and passing therethrough is a barrel 54 which is threaded at its rearward end at 56 and provided at its forward end with pin-like protuberances 58. While a pair of such pins 53 is shown, only one is necessary for a drill having two faces to be ground. The nut 52 bears against barrel 54 and prevents sliding or rotation thereof.

Within the barrel 54- is a spindle 6t) having at its forward end an enlarged head portion 62 which is provided 68 is provided forming the interior of the spindle into a rearward section of enlarged diameter as indicated at 69. In the forward section 70, of smaller diameter, a pin 72 is provided which projects from the internal surface of thespindle.

A spring type adapter '74 is received into the spindle and is provided with a slot 76 into-which the pin 72 projects to prevent rotational movement of the adapter while providing for longitudinal movement of the-adapter within the spindle. The adapter as indicated at 78 is slotted longitudinally over a portion of the length thereof to permit the adapter to'be readily compressed.

The adapter is threaded externally rearwardly at 80 and receives the internal threads 82 of a draw-in spindle -84-which has formed thereon atits rearward extremity a knurled-finger grip 86. The'draw-in spindle 84 intermediate the length thereof is provided with a peripheral flange 88 which is adapted to'abut against the rearward end of the spindle 60.

A nut 90 internally threaded at 92 is received over the externally threaded end 56 of the barrel 54 and a depending flange 93 of the nut engages on the rearward side of the flange 88.

A spring 94 engages between the finger grip 86 and the nut 90 and tends to bias the draw-in spindle 84 and the adapter 74 rearwardly within the barrel 54. Forwardly on the fixture the adapter 74 receives a spring chuck 95 into which is inserted (Figure l) a drill chuck 96, of the usual commercial type, having spring members indicated at 97.

As may be seen from the drawings the retaining or holding means for the drill formed by the chuck 95, chuck 96 and 96a, adapter 74 and the spindles are hollow and releasing a drill from the grip of the springs at 97 will permit the drill to fall rearwardly through the fixture and out the rearward end of the draw-in spindle 84.

In the use of the device to position a drill into contact with a grinding wheel 98 (Figure 6) with the drill inserted into the spring members 97, the finger grip 86 is rotated to draw in the adapter which compresses against the chuck 95 and the chuck 96 to securely retain the drill. The fixture is then pivoted to the desirable angle on the bolt 46 and secured relative to the standard by turning the knurled nut 48. The barrel 54 of the fixture may be adjusted for positioning by loosening the nut 52 and sliding the barrel with the other components relative to the collar 50.

Fine adjustment of the positioning of the retaining drill may be had by rotating the nut 96 which causes the flange 93 to engage the shoulder 88 of the draw-in spindle and to force the shoulder toward the extremity of the spindle 69, whereby the spindle 6i) and the adapter 74 securely retained therein are advanced incrementally to the grinding wheel.

In grinding the drill the fixture secured on the standard 2 is simply rotated and the combination of fixture and standard will be urged into rectilineal movement as the fixture rotates, providing the appropriate surface on the heel of the drill.

For grinding a second face of the drill the finger grip 86 may be advanced rectilineally against the action of the spring 87 to cause the spindle 6t and the holding means therein to slide within the barrel 54, whereupon the spindle may be rotated by turning the finger grip to bring a second of the slots 64 into coincidence with the pin 58. Since the slots are diametrically opposed the retained drill will be rotated 180 degrees, present ing the second face to the grinding wheel. This action takes place without occasioning any movement of the standard.

The rotation of the fixture and standard in the manner already described provide for appropriate facing of the second drill surface while the lip is ground. A plurality of faces may be similarly ground on a tool by 4 appropriately spacing the locking means of the barrel and spindle head portion.

It will be understood that'this invention is susceptible to modification in order to adapt it to difierent usages and conditions and accordingly, it is desired to comprehend such modifications within this invention as may fall within the scope of the appended claims.

I claim:

1. In a holder for use in drill grinding, in combination: a standard which is mounted for rotatable and rectilineal movement, 'a'drill-retaining fixture supported on the standard and having a barrel extending forwardly and rearwardly-of the holder and transversely to the standard, a first spindleislidably and rotatably mounted Within the barrel and having a forward enlarged head portion projecting beyond the barrel, means forming drillholding means of the fixture within the spindle forwardly and including a spring adapter having an enlarged forward portion engaging against the spindle head portion, a cooperating pin and slot arrangement securing said spring adapter and said spindle against relative rotation and providing for relative sliding movement of the adapter and spindle, a draw-in spindle extending into the rearward end of said first spindle and threadedly engaged on said spring adapter drawing said adapter into contact with said first spindle, a nut threaded-1y engaged on the rearward end of said barrel, manually manipulable means on an outer end of said draw-in spindle beyond said nut, a spring engaged between said nut and manually manipulable means biasing said adapter rearwardly, and a flange on said draw-in spindle between said nut and spindle normally urged rearwardly against said nut by said spring and arranged to be urged forwardly against said first spindle to move the spindle relative to the barrel, said nut engaging said flange in a forward movement to position the spring adapter.

2. In a holder for use in drill grinding, in combination: a standard which is mounted for rotatable and rectilineal movement, a drill-retaining fixture supported on the standard and having a barrel extending forwardly and rearwardly of the holder and transversely to the standard, a first spindle slidably and rotatably mounted within the barrel and having an enlarged head portion abutting the forward end of the barrel and provided forwardly internally with an abutment portion, means forming drill-holding means of the fixture within the spindle forwardly and including an adapter having an enlarged forward portion engaging against the spindle head internally on said abutment portion, means securing said adapter and said spindle against relative rotation and providing for relative sliding movement of the adapter and spindle, a draw-in spindle extending into the rearward end of the first spindle and engaged with said adapter for movement therewith and drawing said adapter and said spindle into contact with said forward barrel end, means biasing the draw-in spindle, adapter and first spindle relative to the barrel, a nut threadedly engaged on the rearward endof said barrel, and a flange on said draw-in spindle between said nut and first spindle normally urged rearwardly against said nut by said biasing means, said flange being engageable against said first spindle in forward movement of the nut on the barrel.

3. In a holder for use in drill grinding, in combination: a standard which is mounted for rotatable and rectilineal movement, a drill-retaining fixture supported on the standard and having a barrel extending forwardly and rearwardly of the holder and transversely to the standard, a first spindle slidably and rotatably mounted within the barrel and having an enlarged head portion abutting the forward end of the barrel and provided forwardly internally with an abutment portion, means forming drillholding means of the fixture within the spindle forwardly and including an adapter having an enlarged forward portion engaging against the spindle head internally on said abutment portion, means securing said adapter and said spindle against relative rotation and providing for relative sliding movement of the adapter and spindle, a draw-in spindle extending into the rearward end of the first spindle and engaged with said adapter for movement therewith and drawing said adapter and said spindle into contact with said forward barrel end, means biasing the draw-in spindle, adapter and first spindle relative to the barrel, cooperable means carried by the barrel and drawin spindle limiting the rearward position of the draw-in spindle relative to the said barrel and adjustable longi- References Cited in the file of this patent UNITED STATES PATENTS Hemenway I an. 22, 1924 Boening July 27, 1945 Clarke Oct. 30, 1956 

